Runway adds Mirelo to change the soundtrack and keep the picture

Keep the take, change the sound

Runway’s announcement demonstrates sound generated to match the action in a video, with dialogue retained. Mirelo confirmed the integration in its own post. These are product announcements and vendor demonstrations, rather than independent evidence of how much editing time the tool saves.

The model itself was introduced on 14 October. Mirelo describes replacing unwanted background music with effects and ambience that follow the scene across cuts. The 16 October news is its arrival on Runway, not a second model launch.

What “keeping dialogue” means

Mirelo’s FAQ says the system detects the spoken performance and regenerates it together with the new effects and ambience. That is a different promise from preserving an original speech recording unchanged. For a carefully approved voice performance, the distinction is worth a close listen.

Mirelo’s own Studio and API support up to ten minutes, with longer videos on request through Enterprise. Runway’s announcement does not specify its own duration limit or credit price.

The dialogue is the test to watch

In a reply to Runway, M.M. Izidoro said experience directing dubbing made dialogue retention the part they most wanted to test. It is a useful question from a prospective user, not a published test result:

A promising second pass

The appeal is specific: keep a useful visual take and give its sound another pass. Before delivery, compare the spoken words, delivery and timing with the original. No independent dialogue-fidelity test of this integration was verified.